⇒ You can multiply complex numbers using the same techniques that you use for multiplying brackets in algebra.

⇒ You can use the fact that i = √-1 to simplify powers of i

⇒ i² = -1

⇒ Also see our notes on:

• Imaginary and Complex Numbers
• Complex Conjugation
• Roots of Quadratic Equations
• Solving Cubic and Quartic Equations